Sulfurized indophenol dye and process of making same.



nurse 'TATES ATENT OFFICE.

.ALBERT BER'ISOIIHANN, OF BASLE, SWITZERLAND, ASSIGNOR TO THE SOCIETY OF CHEMICAL INDUSTRY IN IEASLE, OF SAME PLACE.

SULFURlZED lNDOPHENOl. DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 665,726, dated January 8. 1901.

Applic i n fi September 4, 1900. Serial No- 28.989. (Specimens.)

To all 1117mm, it may concern:

Be it known that], ALBERT BER'ISCHMANN, a citizen of the Swiss Republic, and a resident of Basie, Switzerland, have invented a new Sulfurized Indophenol Dyestuif and a Process for its Manufacture, of which the following is a clear and complete specification I have found that contrary to the process hitherto employed for the production of sulfurized coloring matter dyeing non mordanted cotton-that is to say, the so-called Vidal process, which consists in melting different organic compounds with alkali sullids and sulfur-new coloring-matters of great purity and great beauty may be obtained by treating derivatives of paraoxydialphylamins with sodium .tetrasulfid or other polysulfids in presence of different organic solvents and avoiding as much as possible all presence of water.

My process for the manufacture of sulfurized coloring-matters has hitherto been applied with advantage to bodies which furnish leuco-indophenols by reductionthat is to say, derivatives of nitroparaoxydialphylamine and amidoparaoxydialphylamins, as well as corresponding derivatives of indophenols and quinonimids. Thus the process is adapted to the manufacture of sulfurized coloring-matters, which, according to their production and properties, should be considered hydrosulfids or disullids of sulfurized indophenols.

To carry out my invention, I proceed generally as follows: In'an autoclave containing alcohol or another organic solvent I introduce one of the foregoingnamed compoundssodium tetrasulfid or another polysulfid-and I beat the mixture with or without addition of various inorganic or organic bodies, as ammonia, caustic soda, anilin, sulfanilic acid,

- &c., at the temperature which is necessary matters are also sulfurized compounds, dyeing unmordanted cotton most in greenish tints and are preferably mixed with bluish dyes for their employ in dyeing. While the coloring-matters are being isolated the crystalline mass becomes heated because tllere is simultaneous oxidation. This oxidation pro duces a change of the tint in which these coloring-matters dye to deep blue or violet, which change may be'favored by an additionof an oxidizing agent, as hydrogen peroxid, ozone, &c.,.or by different vehicles of oxygen.

For the manufacture of a sulfurized coloring-matter dyeing un mordanted cotton in bluish tints from 2.at-dinitrod-oxy-diphenylamin melting at 198 to 199 centigrade I proceed,

for instance, in the following manner: Ten parts of 2.4rdinitro--oxy-diphenylamin are heated in an autoclavb with eighteen parts sodium tetrasulfid (as much as possible free from water) and fifty to eighty parts alcohol to a temperature of about 145 for ,three to five hours. After cooling the coloring-mattor may be isolated by distilling off the alcohol, or the coloring-matter, separated in the form of crystals with coppery luster, is freed by filtration from the mother-liquor and the alcohol distilled off from this latter. In the first case-that is to say, directly by distilling off the alcohol-a mixture of bluish dyestnif and of a greenish dyestuff is obtained in are violet black blue shaded with brziwn or I green. These latter tints produce deep black. The scconddyestuff, which is isolated from the .filtrate by distilling off the alcohol, dyes non-mordanted cotton in green-black time and .is especially adapted for' shading blue dyestuffs.

By treating the first dyestuff xvi: air or oxygen alone or in presence of ve'-'-.'cles of oxygen or with other oxidizing agents, as

.diamidodiphenylamin, the corresponding indophenols and quinoniniid derivatives, and their reduction products may be employed .withoutessential alteration of the result.

The dyestuE which is derived from 2.4-dinitrot oxy-diphenylamin and forms the main product of reaction is a deep-blue crystalline powder with coppery luster and is soluble in alkali sulfide with blue-violet color. It is essentially different from the dyestuff described in LettersPatent No. 610,541 and derived from 2. l-dinitro-e-oxydiphenylamin according to the Vidal process.

I WhatI claim. is

1. The process for the manufacture of sulfurized dyestufls, dyeing non-mordanted cotton, by treating paraoxydialphylamin derivatives with alkaline polysulfids, in presence of organic solvents, as describe 2. The process for the manufacture of sulf urized dyestuffs, dyeing non-mordanted cotton, by treating paraoxydialphylamin deriva tives with alkaline polysulfids, in presence of organic solvents and treating the dyestufis 36 thus obtained with weak oxidizingagents.

3. The process for the manufacture of a sulfurized dyestuff, dyeing non-mordauted cotton violet blue to black blue by heating 2.4

dinitrol-oxy-diphenylamin with tetrasulfid 5 under pressure in presence of alcohol and separating, after cooling, by filtration, the crystalline dyestufi from the mother-liquor.

4. As a new article of manufacture, the

herein-described dyestufif, which is, in dry 40 state, a crystalline, deep-blue powder with copper-y luster, soluble in alkali sulfids with reddish-blue coloration and dyeing non-mordanted cotton in solutions containing alkali sulfids violet-blue to black-blue shades. 45

In witness whereof I have hereunto signed my name, this 17th day of August, 1900, in the presence of-subscribing witn-esses.-. 4

ALBERT BERTSCHMANN.

Witnesses:

' CLARENCE GIBFORI), GEO. GIFFORD, AMAND BITTER. 

